Hearing aid means the tools, equipment, devices and instruments which can contribute to mend the auditory handicap of hearing disability, and then improve their communicative competence with other people.
Hearing aid can be divided into two categories— the power and the non-power. The power has two types— tube type and transistor type. Transistor type is the most dexterous and light one, so it replaced tube type and has been accepted commonly since 1950.
Broadly speaking, all devices which can enter sound to the wearer can be called hearing aid. And in a narrow sense, hearing aid is just a sound amplifier, by amplifying and modulating sound for the wearer.
Main principle for choosing hearing aid.
The old concept believes that the conductive hearing loss is the best hearing aid users. For the past three or four decades, the hearing aid developed rapidly. The various performance and high quality can satisfy nearly 90% hearing disability, especially the deaf most sensorineural hearing loss with maximum profit.
1, deaf patients had to go through medical treatment or surgery invalid, after the lesion has been completely stable with the hearing aids of distribution. In the case of the recent deaf or in the area in static again after 1 year, and decided to slow the genetic disorders should be careful listening, had better be under hearing audiologists’ guidance.
2, before selecting, should be made in accordance with listening comprehension tests, pure to choose appropriate hearing AIDS. For patients with sensorineural hearing loss should take on the threshold function test to determine CeTing or language favorable effect as far as possible.
3, provide 2 ~ 3 weeks probation for hearing AIDS users. In some countries, that has become a routine. This makes the deaf in specialized personnel under the guidance of the adjustment, the control knob suitable hearing and a satisfactory result.
4, in permitting conditions, select behind the ear aids or In the ear aids for hearing loss, below 90dB, while, select Invisible In canal hearing aids for the above 90dB
5, generally, a hearing aid for one year can remove the auditory handicap, but according to individual licensed or hobbies use ears hearing. Ears hearing has become a trend for deaf children, rehabilitation should promote the use of common language, its advantages using both ears.
